In Grove snails, gene A codes for the production of black pigment. The dominant allele A...
In Grove snails, gene A codes for the production of black pigment. The dominant allele A blocks the production of black pigment, leaving the shell yellow. Pigment is only produced in homozygote recessive aa. A second gene, D, controls where pigment is deposited, with the dominant allele D restricting pigment deposition to a narrow striped area (see Fig. at right). Genotype dd leads to uniform pigment deposition across the shell.
Following several dihybrid crosses (AaDd × AaDd), the ratio of progeny shell phenotypes is 12 solid yellow : 3 yellow-striped : 1 solid black.
a. Indicate which genotype classes give rise to which phenotypes.
b. Draw genetic pathways to illustrate the interactions between genes A and D that give rise to each of the three phenotypes.
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In Grove snails, gene A codes for the production of black
pigment. The dominant allele A...
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98 Mendelian Genetics Exercise D: Mendel's Dihybrid Cross But wait there's morel Mender's monohybrid crosses established that inheritance of phenotypes happened by the interactions of discrete particles' (we now call alleles). Further, he discovered that those alleles segregate during the process of meiosis in the production of gametes, which recombine during fertilization. The result of these two insights can easily be predicted by a technique developed by R. C. Punnett. Once these principles were established, Mendel sought to understand how...
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